Diamond-forming means of paper-bag machines.



J. DUVALL.

DIAMOND FORMING MEANS OF PAPER BAG MACHINES.

APPLICATION FILED MAY 29, 1912.

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DIAMOND FORMING MEANS OF PAPER BAG MACHINES.

APPLICATION FILED MAY 29. 1912.

1,165,765. Patented De0.28,1915.

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.I. DUVALL.

DIAMOND FORMING MEANS OF PAPER BAG MACHINES.

APPLICATION FILED MAY29,1912.

1,165,765, Patented Dec. 28, 1915.

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JAMES DUVALL, 0F CAMAS, WASHINGTON.

DIAMOND-FORMING MEANS OF PAPER-BAG MACHINES.

Application filed May 29, 1912.

To all whom it may concern:

Be it known that I, JAMns DUVALL, a citizen of the United States, and a resident of Camas, Clarke county, State of ashington, have invented a certain new and useful Improvement in Diamond-Forming Means of Paper-Bag Machines, of which the following is a specification.

My invention relates to bag making machines of the type illustrated by the patent to Lorenz & Honiss, dated April 26, 1887, No. 361,951; and familiarity with such machine will be assumed in writing this specification so as to avoid describing the construction and operation of parts not directly concerned in my invention.

The purpose of my invention is facilitat ing the forming of the diamond at the bottom end of the tucked paper tube or blank? I accomplish this object by providing a suction arm for seizing the upper side of the blank, at the bottom end, preceding the operations of said machine in first forming the box and later the diamond. The suction arm so provided by me being adapted to pull the upper or so-called first flap of the box relatively rearward while the paper tube is being advanced or moved through the machine, thus automatically arranging the flaps of the box so relatively pulled apart in the operation of the diamond, and ready to be later folded down by some suitable means, as, for example, by running the paper tube between a pair of rollers.

The details of the means by which I attain my principal object and associated features are hereinafter fully set forth.

Figure 1 is a side elevation of one of said types of bag making machines showing my improvement combined therewith; Figs. 2, 3, l, 5, G and 7 are diagrammatic views illustrating the action of the cooperating parts at different phases in the process of making the diamond, the individual figures representing as follows: Fig. 2 is a side elevation of the cooperating devices, showing the upper portion of the first traveling bed or carriage at an instant after it has started on its forward motion; the box making blades have already taken their position on Specification of Letters Patent.

Patented Dec. 28, 1915.

Serial No. 760,513.

the backward movement of said carriage, and the sweeper fingers automatically insert themselves into the front end of the blank as it moves forward; Fig. 3 is a plan of the vlew shown in Fig. 2, showing also the brackets which support the presser plate; Fig. i is a side elevation of the same parts at a succeeding instant; the box blades have turned over through an angle of almost 180 deg. while the tuck blades maintained their same position; this action forms the box bottom of the bag and at the same time brings the rear face of the box to a point where it will come under the influence of the suction pipe; Fig. 5 is a plan of the view shown in Fig. l, showing in addition the parts referred to in Fig. 3; Fig. 6 is an elevation of the parts at another phase of their forward movement; the lifter plate has been elevated and the sweeper shafts, having a greater forward velocity than that of the traveling bed, have pulled the front face of the box down to an almost horizontal position; Fig. 7 is an elevation of these same parts, showing them at the instant before the diamond is delivered to the gripping rolls; the lifter plate has been elevated to the point where it holds the front flap of the diamond firmly against the sweeper plate and the suction force holds the rear face of the box against the suction pipe, so that it is held backward, the two longi tudinal, opposite forces combining to pull this box out until the diamond is formed; this insures the fact that the diamond will pass under the ironer plate readily and already shaped instead of having to be forced down by the plate to take the diamond form; Fig. 7 is a plan view showing the diamond in its finished form and the box-blades being withdrawn, leaving the blank ready to be carried on to the delivery rolls; Fig. 8 is a side elevation of certain cooperative parts illustrated in the preceding figures, showing the suction pipe fixed instead of being pivotally mounted; and Fig. 9 is a side elevation of the same parts, showing, however, a free moving suction pipe instead of a fixed pipe or a movable pipe operated by a crank arm.

A continuous tucked paper tube, a, made upon a former Z), is moved forward in the machine by the drawing rolls 0 and (Z, and passes between a pair of pressing rolls 6 (the top one only being seen) under the lip-knife g. The paper tube envelops the former knife h, and the striker, t', cuts the tube at periodic intervals forming the blanks. The tube, a, then passes onto a rocking carriage j and the presser plate 70 descends upon the tube, leaving projected, however, enough of the blank to form the bag bottom. It is at this juncture that the striker acts. The box blades m, m, and the tuck blades, or, a, have already entered the tucks at the sides of the tubes, and the rotation of the box-blades will cause the box to be formed. The sweeper fingers 0 have already entered the end of the blank, so that when the box blades act, the under side of the box will be held by the sweeper fingers.

A suction arm, 7), is pivotally connected to an exhauster 9, connecting with some means (not shown) causing a continuous exhaust action. The crank arm, 7), is cocentrically hung on the axis of the delivery roll a, the rotation of which gives an oscillating motion to the suction arm 19. When the box pleats or tucks are formed, the upper side, a of the tube, will be lifted by the action of the box blades m into position to be acted upon by the suction arm 79, which by its suction. seizes said side a; and as the rocking carriage j passes forward the suction arm 7) will operate to relatively pull the upper side a of the box rearward. The suction arm p has a limited oscillating motion in the direction of the rocking carriage j, so as to cause it to reach and seize the upper side of the box, and by the c0ntinuous further forward movement of the carriage, the bag, tightly clamped on the latter is drawn away from the suction arm. The pull of the latter, however, is so strong that the upper side a of the box will be held by said suction arm as long as any portion of said box side a is in contact with the mouth of said suction arm. While this opeiation has been going on, the sweeper fingers have ta en hold of the front, or lower, side, a of the bag and pulled it forward. The lifter plate, 1", then moves up and presses and clamps the forward end of the bottom side of the bag tube against the sweeper plate 0. The forward motion of the bag tube so obtained, and the simultaneously relatively rearward pull of the suction arm above described operate to draw the box flaps apart, and performs the work incidental to the forming of the diamond, as shown in Fig. 7 The presser plate 1.: is now lifted, releasing the bag. The ironer plate a has meanwhile descended and the diamond will pass beneath this plate. The former will restrain the diamond from resuming its original shape. The faster forward movement of the sweeper fingers 0 will then draw the diamond forward into the bite of the delivery rolls 2? and a, from which point the construction and operation of the machine is identical with that of the usual type of bag-making machine.

is apparent that the suction member p re tiresentsmerely one kind of means adapted to hold the rear side of the box back while the forward side is drawn forward in the operation of'forming the diamond, said suction arm yieldingly holding said rear side of the box, that is, permitting the box side held by it to be finally pulled I away from it by reason of the positive grip of the moving mechanical devices contemporaneously holding the forwardside of the box. Thus my improvement properly produces the diamond and will not fail. A suction arm appears tobe the ideal device for the end in view, but I do not wish to be limited to such device.

Prior to my invention the action of the iro-ner plate was depended upon to perform the work of properly folding the box "laps preceding the passing of the blank between the delivery roll's, t, a. This method of forming and folding the diamond shape was very unreliable, for frequently the box did not assume its proper diamond shape, and was, in consequence, crumpled up, thus causing a delay in the procedure and often times spoiling the bag.

The combination of a suction arm, as p, with the described type of machine, on the other hand assures that there will be no failure in the work ofjformingthe box, because by the aid of the suction arm 3) the diamond will be properly formed independently of the ironer plate.

I claim:

1. In a. bag making machine of the type specified comprising means for forming a tucked bag-tube, devices for forming the box on the end of the bag-tube, means for dvancing the bag-tube through the machine, and delivery rolls, the combination of means for seizing and firmly holding the forward end of the box; a rockable suction arm positioned to seize and hold by its suction the rear side of such box, whereby said rear side is relatively pulled back while the box is moved forward and said box sides are shaped into flaps for forming the diamond, and means for moving the suction arm toward the rear side of said box in synchronism with the operation of 'the' means forming said box.

2. In a bag making machine of the. type specified comprising means for forming a tucked bag-tube, devices for forming the box on the end of the bag-tube, means for tively pulled back While the box is moved advancing the bag-tube through the maforward and said box sides are shaped into chine; the combination of means for seizing flaps for forming the diamond.

and firmly holding the forward end of the JAMES DUVALL. 1 box; and a rockable suction arm positioned Witnesses:

to seize and hold by its suction the rear side CECIL LONG,

of such box, whereby said rear side is rela- WV. 0. SCHMITT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

